According to the Islamic tradition, before the Hijri calendar was established, the Arabs used the "aam-ul-feel" - the "year of the elephant" - marked by the eve

According to the Islamic tradition, before the Hijri calendar was established, the Arabs used the "aam-ul-feel" - the "year of the elephant" - marked by the event of Mecca being under attack by an army with war elephants. There's a small chapter in the Quran called "The Elephant" about this.